Radar Ground Clutter display ?

[IvanK]

Something is wrong IMO on the logic behind the display of Ground clutter on the radar. Given the Antenna should be Earth/horizon stabilized, Pitch attitude changes (within limits) should not change the radar scan coverage. However if you vary pitch attitude with radar say 30deg up you can easily get ground clutter appearing at relatively low pitch attitudes.

 

[Fox One]

Currently the radar scan is probably not pitch stabilised as it should, that's why what IvanK described happens. The elevation cursor shows the angle between the antenna and the armament reference line. When changing pitch of the aircraft the elevation cursor should move on the display accordingly: nose up, the cursor moves down. Currently the cursor doesn't move when changing pitch.

[lmp]

If the radar antenna can only tilt 45 degrees upwards, and in your screenshot you're effectively demanding 52 degrees, it seems logical to me that the stabilization would not work under these conditions? It's of course always nice to hear from the developers whether this is working as intended or not :).

[Fox One]

If the radar antenna can only tilt 45 degrees upwards, and in your screenshot you're effectively demanding 52 degrees, it seems logical to me that the stabilization would not work under these conditions?

 

The stabilisation would work fine until he is at an -13deg pitch angle, when antenna would be at its limit. From then on, antenna will remain at its upper limit and when his pitch angle would be -20deg antenna would still be at +25deg and no clutter should appear on scope.

 

It's of course always nice to hear from the developers whether this is working as intended or not .

 

How the real system works is clearly described in real aircraft -34 manual, so currently it is obviously not working as it should.

[cofcorpse]

Could you attach track with this problem, please? Because I don't see this behavior in internal version.

[IvanK]

Ok will try and replicate it in a track

[fjacobsen]

According to the "Aircrew nonnuclear Weapons delivery Manual" max pitch compensation is 45° up/down.

 

Quote:

"A 360-degree compensation is provided about the aircraft roll axis and with the antenna set at either extreme limit of 45 degrees in elevation, 90 degrees of pitch compensation is provided in the opposite direction...."

 

With the radar dish tilted 32° up and pitch at -20° the dish would have to move 32+20=52° and max is 45°, so since it exceeds it limits it will point 32-(52-45)=25° upwards. Additionally the radar beam at the 40nm range is a 8° cone shape (±4°), so that means that the lower part of the beam will be at 21°. In the 20Nm range this is tilted further ±3°, so becomes 18° at the lower part of the beam.

 

So "Fox One" is right about the limit of -13° with the antenna tilted 32° upwards and that something isn´t right.

 

FinnJ

Edited July 26, 2016 by fjacobsen